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                                 Compliments of

                 The  P e r S t o r   S u p p o r t    B o a r d

                               FidoNet  1:102/523
                               AlterNet 7:401/523









            USING AN ADRT CONTROLLER ON AN MFM DRIVE  


Many  computer users express concerns about using the PERSTOR 200 

Series  Advanced Data Recording Technology (ADRT)  Controller  on 

older  drives or MFM drives which were designed for 5 megabit per 

second  write operation.   The disk media becomes more  prone  to 

errors when data is written above the 5mbit/sec. data rate.


Our  Model  PS180-8XT,   Model  PS180-8AT,  and  Model  PS180-16F 

Controllers run between 2.2 and 5.5 megabits during the  critical 

write  phase,  and at 9 megabits during the read,  data transfer, 

and  write  preamble  phases.  Thus the  PS180  models  will  not 

overstress the media on your disk drive,  and yet you will obtain 

a substantial capacity increase of 90% or more. 

_________________________________________________________________


    BASIC DIFFERENCES BETWEEN MFM, RLL, AND ADRT CONTROLLERS  


                        MFM            RLL            ADRT (180)   

Sectors per Track       17             26             31     

Capacity Increase*      0%             50%            90%      

Data Transfer Rate      5mbits         7.5mbits       9mbits

Data Write Rate         5mbits         7.5mbits       2.2 - 5.5

Compatible Drives       MFM            RLL            MFM, RLL

Error Correction        32 bit         32 bit         56 bit 


* increase in MFM format